exam Maths Puzzle Numerical Ability

can someone please help me with this question.
Graph 9x2+4y2=144
Thank you

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exam Other Question

Two classes, one with 50 students and the other with 30, take the same exam. The combined average of both classes is 84.5. If the larger class averages 80, what is the average of the smaller class? I am having difficulty with functions, can someone please help. Determine which functions are inverse to each other. f(x)=6x, g(x)=x/6, h(x)=6/x
Thank you